Resolve "Improvement of tests"

Closes #32 (closed)

Not done due to time:

• test cases for inherited attributes, non-terminal opts, and for endpoints, that always apply
• Investigate possibility of parallelizing tests

ragconnect.base/build.gradle

@@ -266,3 +266,9 @@ publishing {
 // --- Task order ---
 generateAst.dependsOn relast
 publish.dependsOn jar
+
+// --- Misc ---
+dependencyUpdates {
+    gradleReleaseChannel = 'current'
+    revision = 'release'
+}